Awards Beyond the Tribunal's Mandate: Ultra Petita, Interest, Costs and Partial Awards

Short answer: A tribunal may decide only the disputes and relief submitted to it. An award that grants something not requested, decides an issue outside the arbitration agreement, awards interest or costs without a legal or procedural basis, or gives relief against a person who was not properly before the tribunal may be vulnerable as ultra petita or extra petita. The UAE Federal Arbitration Law, DIFC Arbitration Law, ADGM Arbitration Regulations and DIAC Rules all protect the boundary between the parties’ submission and the tribunal’s power. Where the valid and invalid parts are separable, the court may set aside only the excess rather than the entire award.

Partial and interim awards are not automatically defective. They can efficiently determine liability, jurisdiction, security or a discrete claim before the final award. The risk arises when the tribunal treats a preliminary ruling as final without giving the parties an opportunity to be heard, grants a remedy never pleaded, calculates interest beyond the requested period, or allocates costs contrary to the clause, rules or mandatory seat law.

This article explains mandate boundaries in UAE, DIFC, ADGM and DIAC arbitrations. It covers ultra petita, interest, party and tribunal costs, partial and interim awards, severability, correction, set-aside and enforcement strategy. It is general information, not legal advice on a specific award.

Contents

1. The tribunal’s mandate
2. Ultra petita, extra petita and infra petita
3. How the scope is defined
4. UAE federal law and excess of jurisdiction
5. DIFC and ADGM limits
6. Interest: rate, period and compounding
7. Costs and legal fees
8. Partial, interim and preliminary awards
9. Severability, correction and remittal
10. Evidence, objections and deadlines
11. Set-aside and enforcement consequences
12. Practical checklist and FAQs

1. The tribunal’s mandate

Consent is the source of jurisdiction

An arbitral tribunal does not possess the general jurisdiction of a national court. Its authority comes from the arbitration agreement, the parties’ submissions and the procedural rules incorporated into the clause. The tribunal can decide the disputes within that consent and exercise the powers granted by the seat law and rules. It cannot create jurisdiction merely because a claim is commercially connected to the contract.

The tribunal’s mandate has at least four dimensions:

• Persons: the parties bound by the arbitration agreement and any validly joined or consolidated participant;
• Subject matter: the disputes covered by the clause and the pleadings;
• Remedies: the relief requested, legally available and submitted for determination; and
• Procedure: the agreed rules, seat law, timetable, language and limits on the tribunal’s powers.

Mandate is wider than the prayer for relief, but not unlimited

A tribunal may grant the legal consequence of a pleaded claim even if the party did not use the perfect label for the remedy. It may also calculate interest or costs where the contract, rules or applicable law authorise them. The boundary is crossed when the award changes the dispute, grants a new head of relief, decides against a person who was not a party, or awards a remedy that the parties had no fair opportunity to address.

Why the final dispositive section matters

Jurisdiction is assessed against the claim, defence, counterclaim, terms of reference, procedural orders and final dispositive section. A reasoned discussion in the body of the award may not cure a dispositive order that grants relief outside the submission. Drafting teams should review the operative paragraphs separately from the reasoning before the award is issued.

Commercial examples

Consider a contractor that claims AED 8 million for unpaid interim certificates and asks for contractual interest from the due dates. An award of AED 8 million plus properly pleaded interest may be within the mandate. An order transferring title to the employer’s equipment, however, would require a separate pleaded basis and a fair opportunity to address that remedy. Likewise, a claim under a main contract does not automatically authorise a declaration about a separate guarantee or a subcontract.

The same discipline applies to a counterclaim. If the respondent seeks delay damages and the claimant answers only on causation, the tribunal should not quietly convert that counterclaim into an unpleaded restitution order. If a party asks for a declaration that an agreement was terminated, the tribunal may need to decide the legal effect of termination in order to quantify damages, but it should explain why the declaration and any consequential relief fall within the submission.

2. Ultra petita, extra petita and infra petita

Ultra petita

Ultra petita means awarding more than the party requested. Examples include awarding damages above the pleaded amount without a procedural basis, granting interest for a period not claimed, ordering a wider injunction than the application sought, or awarding legal fees when the parties and rules did not authorise them.

Extra petita

Extra petita means deciding something outside the claims or submission. Examples include deciding ownership of a separate asset, imposing obligations under a different contract, determining a dispute reserved for another forum, or granting relief against a non-party. A claim may be factually connected to the main contract and still fall outside the arbitration agreement.

Infra petita

Infra petita describes a failure to decide a claim or defence properly submitted. It is different from an award that rejects a claim with reasons. The remedy may be an additional award, interpretation or remittal if the applicable law and rules permit it. A party should ask the tribunal to address an omitted claim promptly rather than assuming a set-aside application is the first option.

Not every numerical error is ultra petita

A mathematical error in a quantified claim is not automatically an excess of mandate. If the tribunal decided a pleaded loss and made a calculation mistake, the appropriate route may be correction or an interest and costs application. The applicant must distinguish an error in deciding an authorised claim from a decision on an unauthorised claim.

3. How the scope is defined

The arbitration clause

Begin with the clause’s wording. “Any dispute arising out of or in connection with this Agreement” can cover contractual and closely connected non-contractual claims, while a clause limited to disputes “under” a contract may be narrower. The parties should address guarantees, side letters, subcontractors, statutory claims, restitution, tort, termination and post-termination obligations expressly.

The notice and terms of reference

The notice of arbitration frames the initial dispute. Institutional rules, procedural orders or terms of reference may then define the issues. An amendment to pleadings may expand or clarify the submission only if permitted by the rules and fair to the other party. A tribunal should record jurisdictional decisions and any reservation of rights.

Defences and set-off

A defence or set-off can be within the tribunal’s mandate even if it is not a freestanding claim, provided it is connected to the dispute and the rules permit it. A counterclaim is different: it may require a separate jurisdictional basis, notice and opportunity to respond. The award should identify whether an amount is awarded as damages, set-off, restitution, interest or costs.

Amendments and changing theories

Construction and commercial cases often evolve after document production. A party may discover a different valuation theory, add a new contractual provision or revise the period for interest. Procedural fairness requires a clear amendment request, a chance to respond and a ruling on any prejudice or limitation issue. A tribunal should not treat a new theory as a mere “clarification” if it changes the factual or legal basis of liability. The safest award records the procedural order that admitted the amendment and identifies which relief remains outside the amended case.

Joinder and consolidation

Joinder or consolidation can enlarge the procedural landscape but does not automatically enlarge the tribunal’s power over every dispute involving the new participant. Check consent, compatible arbitration agreements, the institutional rule and any order permitting joinder. An award against a joined party should identify the legal basis for jurisdiction.

4. UAE federal law and excess of jurisdiction

Article 53 grounds

Federal Law No. 6 of 2018 permits annulment where the applicant proves statutory grounds, including the absence or invalidity of the arbitration agreement, incapacity, lack of proper notice or inability to present the case, improper tribunal constitution, procedural irregularities affecting the award, failure to apply agreed law where relevant, and decisions outside the scope of the submission. The court may also act where the subject matter is not arbitrable or the award violates UAE public policy.

An excess-of-mandate argument should therefore be tied to the Federal Law ground dealing with matters not contemplated by or falling outside the submission. The applicant should identify the pleaded claim, the relief requested, the operative paragraph and the precise excess. A general assertion that the tribunal “went too far” is insufficient.

Partial and interim awards under Article 39

Article 39 allows the tribunal to issue interim awards or awards on part of the claims before the final award. Interim awards are enforceable through an order on petition. The award should make clear whether it finally determines liability, grants temporary protection, decides a discrete claim or reserves quantum and costs for later determination.

Costs under Article 46

Article 46 allows the tribunal, unless the parties agree otherwise, to evaluate arbitration costs, including tribunal and tribunal-appointed expert fees, and to order one party to pay all or part of those costs. It also permits a court, on request, to review the arbitrators’ valuation of their fees or costs for proportionality. This statutory treatment of arbitration costs should not be confused with a general power to award every item of party legal expenditure; the contract and applicable rules must be checked.

Finality, correction and interpretation

After an award, the tribunal’s authority is limited. The Federal Law provides a mechanism for interpretation of an ambiguity and correction or additional award requests within the prescribed period. A tribunal cannot use interpretation to add a new remedy or repair an ultra petita decision by changing its substance. The court deadline for annulment should be protected while a tribunal request is pending.

5. DIFC and ADGM limits

DIFC Article 41

Article 41 of the DIFC Arbitration Law permits setting aside where the award deals with a dispute not contemplated by or not falling within the submission, or contains decisions beyond the scope of the submission. If the authorised and unauthorised decisions can be separated, only the excess portion may be set aside. DIFC Courts describe these grounds as exhaustive and not a merits appeal.

The DIFC Court’s analysis focuses on the arbitration agreement, submission, pleadings and award. A party should not ask the court to reinterpret the contract simply because it dislikes the tribunal’s construction. The question is whether the tribunal decided an issue it was not empowered to decide, not whether the tribunal was right on the issue it was empowered to decide.

ADGM section 58

Section 58 of the ADGM Arbitration Regulations 2015 follows the Model Law structure. An award may be set aside if it decides matters beyond the submission, subject to separation of the valid and invalid parts, or if non-arbitrability or UAE public policy is engaged. An ADGM court challenge is therefore built around the submission boundary, not a rehearing of evidence.

Three different clocks

For an onshore UAE seat, the annulment period is generally 30 days after notification. DIFC and ADGM generally use a three-month period, subject to their correction and extension rules. The parties must identify the seat before deciding how a partial or costs award will be challenged.

6. Interest: rate, period and compounding

Interest is part of the mandate question

Interest may be claimed as damages, a contractual entitlement, a statutory consequence, a financing cost or post-award relief. The tribunal should identify the legal source, the period, the rate, the currency, the compounding method and the date from which interest runs. If the claim sought interest only to the award date, a post-award order may be ultra petita unless the applicable law or rules authorise it independently.

Pre-award and post-award interest

Pre-award interest usually depends on the contract law, applicable statutory law and the pleaded claim. Post-award interest may depend on the seat, enforcement forum, substantive law, institutional rules or the wording of the award. The tribunal should avoid silently changing from simple to compound interest or applying a rate that was never addressed in submissions.

Interest on interest

Compounding is especially sensitive. The party seeking compound interest should plead the legal and factual basis, identify the compounding intervals and provide a calculation. A tribunal that awards compound interest without giving the parties an opportunity to address it risks a due-process or excess-of-relief challenge. A court assessing the award should distinguish an error in a calculation from an unauthorised category of relief.

Interest and public policy

Interest may be reviewed through the law applicable to the merits and the mandatory public policy of the seat or enforcement forum. Sharia, statutory, sanctions or public-order issues may become relevant depending on the parties and transaction. Obtain a seat-specific opinion before assuming that a contractual interest clause will be enforced exactly as written.

Currency, tax and withholding

Interest disputes can also arise from currency conversion and tax treatment. If the principal is awarded in one currency but the calculation uses another, the award should state the conversion date and source. A tribunal should distinguish a tax adjustment that is a pleaded component of loss from a new withholding or gross-up order introduced in the dispositive section. If payment is subject to mandatory withholding, the award should explain whether the debtor must gross up, provide evidence of remittance or seek directions from the enforcement court.

Drafting the dispositive paragraph

The operative section should state the principal, rate, start date, end date, compounding method, currency and payment date. If the tribunal reserves calculation, state the method clearly. A vague sentence such as “interest shall continue until payment” may create enforcement disputes and a claim that the tribunal reserved or granted more than it decided.

7. Costs and legal fees

Three categories of cost

DIAC Rule 36

DIAC Rules 2022 Article 36 defines arbitration costs broadly, including the Centre’s fees, tribunal and expert fees, legal representatives’ fees and expenses and other party costs assessed by the tribunal. The tribunal may issue a costs-only award and the final award must fix and apportion costs subject to the Rules. The tribunal should invite submissions and give both parties an opportunity to address reasonableness and allocation.

Costs beyond the request

A tribunal can create an ultra petita issue by awarding a category of costs not claimed or permitted by the governing rules. It can also fail to decide a costs claim that was reserved and properly submitted. The parties should provide a schedule, supporting invoices, the requested allocation and any contractual or procedural basis for party costs.

Costs of a partial award

When liability is decided in a partial award, costs may be reserved or apportioned provisionally. The award should say whether the costs decision is final, provisional or subject to the final award. A tribunal that allocates all costs before quantum and causation are decided may create an avoidable challenge if the allocation depends on issues still open.

Security and payment mechanics

A partial award that orders payment should distinguish a final monetary determination from security for a later award. The tribunal should address whether payment is immediate, conditional on security, or subject to set-off or repayment if the reserved issues produce a different balance. Banking details, escrow language and the deadline for payment should be handled carefully: an enforcement court can execute a clear obligation, but it should not be asked to design the payment mechanism or resolve an omitted condition.

8. Partial, interim and preliminary awards

Different functions

• Interim award: temporary or urgent relief, security, preservation or a provisional determination.
• Partial award: final determination of one or more claims, issues or heads of relief while other matters remain.
• Preliminary ruling: a procedural or jurisdictional decision that may not finally determine the claim.
• Final award: the award that closes the dispute, subject to permitted correction or additional-award mechanisms.

When partial awards help

A partial award can narrow the evidence, resolve liability before quantum, determine jurisdiction, or establish entitlement to payment. It can reduce delay and encourage settlement. It also creates an early enforcement and challenge point, so the tribunal should state what is finally decided and what remains open.

Risks of a partial award

A partial award may be vulnerable if it decides an issue without hearing the parties, duplicates a later final award, awards relief beyond the claim, or uses findings that prevent fair determination of the reserved issues. The tribunal should give the parties a clear opportunity to address the legal effect, enforceability and costs consequences of a partial award.

Multiple awards and res judicata

A partial award may have binding or preclusive effect depending on the seat law, rules and wording. The final award should not contradict it. The parties should identify whether a partial award is intended to be immediately binding, enforceable or merely procedural, and should avoid pleading the same claim twice.

9. Severability, correction and remittal

Severability

Where an award contains both authorised and unauthorised decisions, the court may set aside only the excess if the parts are legally and practically separable. The applicant should identify the paragraphs, sums and obligations that can stand independently. The respondent may argue that the excess infected the entire reasoning or quantum analysis.

Correction and additional award

DIAC Rule 37 provides a route for interpretation and correction of clerical, typographical, computational or similar errors, and for an additional award where the tribunal omitted a claim. Those mechanisms do not permit a tribunal to add a new head of damages, change the interest theory or award costs that were never within the submission. Protect the court deadline while seeking correction.

Remittal

A seat court may suspend challenge proceedings and give the tribunal an opportunity to cure a defect where the applicable law allows. Remittal is appropriate for a curable omission or clarification, not to authorise a new dispute. The parties should propose precise directions and preserve objections to jurisdiction and due process.

10. Evidence, objections and deadlines

Object during the arbitration

A party that believes a claim, interest head or costs category is outside the mandate should object promptly. State the legal basis, the prejudice, the relief sought and the reservation of rights. Participate under protest where necessary. Silence can support waiver, estoppel or a finding that the party accepted the tribunal’s procedural authority.

Build a mandate matrix

Challenge deadlines

For an onshore UAE seat, Federal Law No. 6 of 2018 generally imposes a 30-day annulment period after notification. DIFC and ADGM generally provide three months, subject to correction, review and extension provisions. A party should calculate the earliest possible deadline, file protectively if necessary and avoid relying on an informal assurance that a tribunal request suspends the court period.

Preserving the record

The challenge record should include the arbitration clause, every version of the prayer for relief, procedural orders on amendments, hearing transcripts, written submissions on interest and costs, and the complete award. Make a paragraph-by-paragraph comparison showing what was requested, what was admitted, what was decided and what was ordered. This allows counsel to demonstrate a genuine excess of mandate rather than a disguised appeal on facts or valuation. It also helps the enforcement court sever an offending interest or costs paragraph while preserving the principal award.

11. Set-aside and enforcement consequences

Domestic enforcement

An interim or partial award may be enforceable under the seat statute if it meets the legal requirements. The applicant should file the operative award and explain which parts are immediately enforceable and which remain reserved. A court should not be asked to execute a reasoning paragraph that does not contain a clear obligation.

Foreign enforcement

A foreign enforcement court may refuse or limit relief if the award exceeded the submission, decided a non-arbitrable matter or was set aside at the seat. The winning party should explain severability, the status of any set-aside application and the exact relief to be enforced. Interest and costs may be treated differently from principal, especially where they were not clearly awarded or are contrary to local public policy.

Interest and costs at execution

The execution court typically enforces the award as written. It should not be asked to invent a rate, extend a period or add costs omitted by the tribunal. A creditor should obtain a clear interest and costs paragraph before enforcement; a debtor should challenge ambiguity or excess through the seat or enforcement procedure available under the applicable law.

12. Practical checklist and FAQs

Drafting and tribunal checklist

• Define the disputes, parties, connected contracts and available remedies.
• State whether interest, compound interest, legal fees and enforcement costs may be awarded.
• Identify the seat, rules, language and form of the award.
• For a partial award, specify what is final, what is reserved and whether immediate enforcement is intended.
• Invite submissions on interest, costs, severability and the legal effect of a partial award.
• Draft dispositive paragraphs with principal, interest, rate, dates, currency and costs stated precisely.
• Use correction or additional-award mechanisms only for permitted omissions or errors.

Challenge checklist

• Identify the seat court and calculate the strict deadline.
• Map each impugned paragraph to excess of submission, due process, composition, non-arbitrability or public policy.
• Separate an unauthorised remedy from a mere error in calculating an authorised remedy.
• Ask for partial annulment where the invalid portion is severable.
• Preserve the record of objections and any waiver or reservation.
• Coordinate with enforcement, security, insolvency and asset-tracing strategy.

Frequently asked questions

Is awarding more money than claimed always ultra petita?

Not always. The tribunal may quantify a pleaded claim, award authorised interest or apply a contractual formula. The issue is whether the amount or category of relief was within the submission and whether the parties had a fair opportunity to address it.

Can a tribunal award interest if the claim did not state a precise rate?

It may be able to apply a legally authorised rate or assess a pleaded interest entitlement, but it should give the parties an opportunity to address the basis, period and calculation. An unexplained rate or compounding method creates challenge and enforcement risk.

Can a tribunal award legal costs in an onshore UAE arbitration?

Check the contract, applicable rules and seat law. Federal Article 46 addresses arbitration costs; DIAC Rule 36 expressly includes legal representatives’ fees and expenses within the costs the tribunal may assess. The tribunal should still invite submissions and state the basis of allocation.

Can a partial award be enforced immediately?

Potentially. Federal Article 39 expressly addresses enforceability of interim awards, while institutional rules and the seat law determine treatment of partial awards. The operative section must clearly state the binding obligation and distinguish it from reserved issues.

What if the tribunal omitted a claim?

Consider an additional-award request within the applicable rule period. Do not use the request to add a new claim or rewrite the reasoning. If the omission cannot be cured, the available remedy may involve remittal or annulment under the seat law.

Can the court correct the tribunal’s interest calculation?

The court’s role is generally supervisory, not an appeal on quantum. A permitted tribunal correction is preferable for a clerical or computational error. A court may address enforcement formalities or statutory costs powers, but it should not invent a new award.

Does a party lose the excess-of-mandate objection by participating?

Not automatically, but delay is risky. Object when the issue arises, state the legal basis and reserve rights. The seat law and rules may treat failure to object as waiver or may limit the court’s ability to entertain a late complaint.

Official sources and disclaimer

Primary materials reviewed include UAE Federal Law No. 6 of 2018 Concerning Arbitration, the DIAC Arbitration Rules 2022, the DIFC Courts’ Article 41 analysis, the ADGM Courts legislation page and the DIAC arbitration legislation page. Official materials were checked on 31 October 2026. Laws, rules, court practice and institutional procedures can change. This article is educational only and does not create a solicitor–client relationship or replace advice on a particular award, contract or challenge.